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Did you know?
About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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The human body produces and destroys 15 million blood cells every second.